Benchmark: exec vs replace - MeasureThat.net

Script Preparation code:

str = '<p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none"><span data-variable="true" data-type="TEXTAREA">{{{description}}}</span></span></p><p style="margin: 0; line-height: 1.5"></p><p style="margin: 0; line-height: 1.5"></p><table><tbody><tr><td colspan="1" rowspan="1" style="width: 380.33093525179856pt; height: 18.75pt; vertical-align: top; border: 0.5pt solid #000" colwidth="507.1079136690647" colheight="25" data-border="true"><p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none"><span data-variable="true" data-type="TEXTAREA">{{{DealProduct.[0].product.description}}}</span></span></p></td><td colspan="1" rowspan="1" style="width: 380.33093525179856pt; height: 18.75pt; vertical-align: top; border: 0.5pt solid #000" colwidth="507.1079136690647" colheight="25" data-border="true"><p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none">продукт сделки</span></p></td></tr></tbody></table><p style="margin: 0; line-height: 1.5"></p><p style="margin: 0; line-height: 1.5"></p><p style="margin: 0; line-height: 1.5"></p><table><tbody><tr><td colspan="1" rowspan="1" style="width: 267pt; height: 18.75pt; vertical-align: top; border: 0.5pt solid #000" colwidth="356" colheight="25" data-border="true"><p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none"><span data-variable="true" data-type="TEXTAREA">{{{Task.[0].description}}}</span></span></p></td><td colspan="1" rowspan="1" style="width: 267pt; height: 18.75pt; vertical-align: top; border: 0.5pt solid #000" colwidth="356" colheight="25" data-border="true"><p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none">задачи</span></p></td></tr></tbody></table><p style="margin: 0; line-height: 1.5"></p><p style="margin: 0; line-height: 1.5"><span style="font-size: 18pt; font-family: Times New Roman; font-weight: normal ; font-style: normal; text-decoration: none"><span data-variable="true" data-type="TEXTAREA">{{{createdBy.division.description}}}</span></span></p>';
re = /<span(?=(?:[^>]*style="([^"]*)")?)[^>]*?><span[^>]*data-type="TEXTAREA"[^>]*>{{{(.*?)}}}<\/span>/;

Tests:

exec
re.exec(str)[1] re.exec(str)[2]
replace
str.replace(re, (_, m1,m2) => { return _ })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
exec
replace

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one month ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data.

**Benchmark Definition**

The benchmark is called "exec vs replace" and its description is empty. It involves preparing two JavaScript variables: `str` and `re`. The script preparation code creates a large string (`str`) containing HTML markup with placeholders for dynamic content (e.g., `{{{DealProduct.[0].product.description}}}`). The regular expression (`re`) is defined to match specific HTML elements.

**Individual Test Cases**

There are two test cases:

1. **exec**: This test case uses the `exec` method of the regular expression object `re` to execute it on the string `str`. Specifically, it extracts the first and second capture groups (i.e., `m1` and `m2`) from the match using `re.exec(str)[1]` and `re.exec(str)[2]`.
2. **replace**: This test case uses the `replace` method of the string object `str` to replace occurrences of the matched HTML elements with a new value, which is simply the original string (_).

**Library Used**

No specific library is mentioned in the code. The regular expression syntax and the `exec` and `replace` methods are built-in JavaScript features.

**JavaScript Feature/Syntax Used**

The test case uses regular expressions (regex) to match HTML elements. The regex pattern `/<span(?=(?:[^>]*style=\"([^\"]*)\")?)[^>]*?><span[^>]*data-type=\"TEXTAREA\"[^>]*>{{{(.*?)}}}<\/span>/` is used to match the desired HTML structure.

Here's a breakdown of the regex pattern:

* `/<span/`: Matches the opening `<span>` tag.
* `(?:[^>]*style=\"([^\"]*)\")?`: An optional group that matches the `style` attribute and captures its value (if present).
* `[^\]*?>`: Matches any characters (except `>`) until the closing `>` character.
* `><span[^>*]data-type=\"TEXTAREA\"[^>*]}>{{{(.*?)}}}<\/span>/`: Matches the opening `<span>` tag, followed by any characters until the matching closing `</span>` tag.

The capture groups `(.*?)` are used to extract the dynamic content (e.g., `{{{DealProduct.[0].product.description}}}`).

**Pros/Cons of Different Approaches**

In this benchmark, two approaches are compared:

* **exec**: This approach uses the `exec` method of the regex object to execute it on the string. It returns an array containing the matched groups.
* **replace**: This approach uses the `replace` method of the string object to replace occurrences of the matched HTML elements with a new value.

The pros and cons of these approaches are:

* **exec**:
	+ Pros: Can be faster for simple matching tasks, as it doesn't require creating a new string.
	+ Cons: Requires creating an array to store the captured groups.
* **replace**:
	+ Pros: Can create a new string with replaced values.
	+ Cons: May be slower than `exec` due to the creation of a new string.

**Other Alternatives**

Other alternatives for this benchmark could involve using different JavaScript methods, such as:

* `String.prototype.match()`: Returns an array of matches, similar to `re.exec()`.
* `String.prototype.replaceAll()`: Replaces all occurrences of a pattern in a string.
* `DOM methods**: Using the Document Object Model (DOM) APIs to manipulate and search HTML elements.

These alternatives might be more suitable for certain use cases or browsers.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Windows

View result in a separate tab

Test name	Executions per second
exec	541841.3 Ops/sec
replace	740312.1 Ops/sec

Related benchmarks:

exec vs replace (version: 0)

Comparing performance of: exec vs replace

Created: one year ago by: Guest

Jump to the latest result

exec

replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one month ago):